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Stale fragments pollute search results after inverted index updates

Stale fragments pollute search results after inverted index updates: a task in LegoFlow-SWE (Harbor dataset). Symptom: After updating or deleting rows in a dataset that has an inverted index (full‑text search), queries may return results from physically deleted or outdated data fragments. This…

The task

**Symptom:** After updating or deleting rows in a dataset that has an inverted index (full‑text search), queries may return results from physically deleted or outdated data fragments. This leads to duplicate or incorrect matches that should have been filtered out.

Part of Lego-X/LegoFlow-SWE.